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Pal decoder – Circuit Schematic
Pal decoder
After some years i started using the NMS8280 again for HAM radio purpose. When sending a signal in the air, radio amateurs should always identify by giving thei...
Bruces TPU Theory and Experiments – Circuit Schematic
Bruces TPU Theory and Experiments
SM is merely pointing out that the tube is capable of producing those frequencies. he talks about using TV tubes to get a better sound at higher frequencies. an...
Tesla HV Coil – Circuit Schematic
Tesla HV Coil
Is it (when operated through a spark gap) allways a quarter wave, or a half wave or multiple of a whole wave so that there are 2* n maximums that are achieved. ...
Command Transmitter-Receiver – Circuit Schematic
Command Transmitter-Receiver
The Command Transmitter-Receiver (A3023) is intended to test the command receiver we propose for the ISL (Implantable Sensor with Lamp) in our Conceptual Design...
Antenna Combiner – Circuit Schematic
Antenna Combiner
The Antenna Combiner (A3021) is an active combiner for four 50- © coaxial antenna connections. The output is a combination of the four inputs with net gain of ...
Test Transmitter – Circuit Schematic
Test Transmitter
The Test Transmitter (A3020) is a combination of three circuits. Its purpose is to allow us to test the Subcutaneous Transmitter ( A3019 ) and to investigate SA...
Demodulating Receiver – Circuit Schematic
Demodulating Receiver
The Demodulating Receiver (A3017) contains a 902 ’930 MHz 30-dB amplifier, a downshifer, a 60-dB 50-MHz limiting IF amplifier, a frequency discriminator, and ...
RF Combo – Circuit Schematic
RF Combo
The RF Combo (A3016) is a combination of three circuits. Its purpose is to provide circuit boards for Stage Four of our subcutaneous transmitter development. Th...
RF Tester – Circuit Schematic
RF Tester
The RF Tester (A3014) is a combination of four circuits. Its purpose is to test several circuit ideas, both by implementing them, and by providing better suppor...
RF Spectrometer – Circuit Schematic
RF Spectrometer
The A3008, when plugged into the same LWDAQ Multiplexer, can create bad messages in a Data Receiver ( A3018 ). Set the A3008 local oscillator to its minimum (DA...
Radio QRP – Circuit Schematic
Radio QRP
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Mic wiring Servicing and alignment – Circuit Schematic
Mic wiring Servicing and alignment
The FDK Multi-750e was launched in the UK in 1981. A 2m ham radio multimode tranceiver, at a good price, and with a matching 70cm transvertor controlled from th...
LOW POWER FM TRANSMITTER – Circuit Schematic
LOW POWER FM TRANSMITTER
A low power fm pirate radio. The output power is around +35 dBm ( 3. 16 watts) over 50 ohms load and +24 volts power supply. The project consists in a hartley o...
synthesized PLL for Low Power FM transmitter – Circuit Schematic
synthesized PLL for Low Power FM transmitter
This is schematic of a synthesized PLL for the Low Power FM transmitter. By the way, you also can use it with other circuits, just pay attention to recalculate ...
Old Radio Information – Circuit Schematic
Old Radio Information
This is an area that is dominated by commercial information resellers. One outstanding exception is Nostalgia Air, which has a growing data base of radio schema...
National Radio Institute (NRI) AM radio kit – Circuit Schematic
National Radio Institute (NRI) AM radio kit
This National Radio Institute radio kit covers the AM broadcast band from 550 to 1700 KHz. The set was designed to be constructed as part of a radio course taug...
Amateur Radio – Circuit Schematic
Amateur Radio
All feature crystal-controlled transmitters and tunable superregenerative receivers with RF preamplifiers designed for operation on the 2, 6 or 10 meter amateur...
Mixers – Circuit Schematic
Mixers
Mixers (sometimes known as frequency converters), modulators, balanced modulators and other circuit blocks are considered below. Each works on the same basic pr...
Ripples in the Ether – Circuit Schematic
Ripples in the Ether
Tomas OK4BX came prepared with an excellent slideshow presentation of the DDS-driven MEPT that he and his father recently put on the air. W0EA was able to show ...
Feld-Hell electronic circuitry and schematics – Circuit Schematic
Feld-Hell electronic circuitry and schematics
The 900 Hz tone is generated with an LC-oscillator. The "L" part of the "LC" is provided by the inductance of the oscillator`s output coupling transformer T1. I...